Dynamo-electric machine.



W. J. RICHARDS.

DYNAMO ELEGTRIG MACHINE.

'APPLIOATION FILED un. a1, 1901.

Patented Sept. 7, 1909.

UNITED srarasrarnnr OFFICE.

WALTER ci. RICHARDS, Ol" NQBWOOD, R10, ASSIGNOR T0 ALLIS-GHALMES OMPNY.

A CORRWATIQN 0F NEW ll-WESEY.

D-YNAMQHELECTBIQ, NAQHINE.

Byocleatiop. ai Letters Estant.

Patented Sept. 7,

Application led January 31, 1907; Serial No. 364,961).

To,- all lwhom "it may concern.:

ne it known that I Wimax J. momias, citizen .of the United tates, residing all. Norwoodnin the county of Hamilton and State of 0h10, have invented certain new and useful Improvements in Dynamo-Electric Machines, of which the following is a full, clear, and exact specification.

M n invention relates to dynamo-electric mac lines and particularly to the field magnets thereof. 4

The object of m invention is to. provide a field magnet whie will be well ventilated, very sim le in construction, and inexpensive to manu acture. With these ends in view, I divide the coils 1n sections and-arrange, support and space them apart in such a marmer and with few parts so constructed that a large amount of an' can circulate around and between ,the

coils as. will be described more 'fully in this specification.

M invention further consists in certain nove details of construction and combinations and arrangements of arts described yin the specification and set flirth in the appenied claims.

In thedrawin Filgure 1 is a4 arti'al side elevation of a fie d y0 e provide with compound wound field magnets equi ped with my invention; Fig Q is ascctional) elevation of the saine showingone of the field magnets partly in section; ig. 3 is an end view of one of my im roved field magnets; Fig.,4 is a sheet meta punching `from which one of the coil separators are made.; and Fig. 5 is an isometric view of one o'gf the se arators.

\ Referring now to the figures o the draw ings, 10 represents a rtion ofthe {ield yoke `tovvhich the fiel ma etsrll are secured. 'The field poles 12 in this case are laminated and are secured to the yoke b bolts, one of which is shown at 13. Ea i field magnet in this instance is compound wound having series and shunt coils 14 and 15, the arrangement and manner of su porting and s acin of which will now be described.' n o er thatV the coils may not become overheated, I divide the shunt coils into two sections 15 andV 15 and arrange them concentrically at' the armature end of the pole and space them apart so that air c pass freely outward between the shunt coils onto the series coil, the series and shunt so as to` be U or channel shaped.

lshown in Fig. 4. When.

`this case by coils likewise being spaced .apart uswill be described. The spacing or separating devices for the coils consist, in this case, of T- the series and shunt coils as to space them, glpart. The spacing devices y are of such a ape that they interfere with the flow of air as little as possible, and are preferably of the form, shown inFi 5, the two arms 17 and 18 having their si es extending` upward he spacin devices in this case are each formed from a rectangular piece of sheet metal A, as the rectangular piece is cut by a die from the sheet4 metal stock, it is also cut along thefull lines a and c forming tabs 20 an 21,.. To obtain the desired shape for the spacing member the sides of the rectangular ieee are bent upward at ri ht angles to t e central portion along the nes b and b forming the U or channel shaped arm 17 and the tabs 20 and 21 are bent upward along the lines c and c and the end is bent upward lalon the line d forming the U oi channel sha e arm 18 at right angles to the arm 17. he stamping, cutting and bending are preferably done by one operation, although if desired the ben ing may be done by a second operation. .It is seen that u large number of those spacing' devices can be easily, cheaply, and quickly made and without any loss or Waste of niuterial. Il'Y desired the spacing members may he of cast metal.

The siacing devices are each preferably arrange with the parallel sides of the arms bearing on the sides of thercoils. With this arrangement oi the spacing devices, the edges of the lattercan not cnt the insulation of the coils. vices as necessary may b employed in each magnet. In this case,Ifhave shown eight.' T he coils are retained on the 'pole pieces in l the end heads or plates 22, the corners 23 of which extend beyond the edge of the laminas and serve as coil seats. This is shown most clearly in Figs. 1 and 3. Thus it is seen 'Y that between the corners of the end plates therefis nothing to block the Ventilating passage-ways. The series coils As many of the spacing de-v ics Cilll preferably bear against the field yoke, thou h separated therefrom by mica or other insu ation 24.,

It is ap arent that with this construction a large vo ume of air will circulate around and between the coils and dissipate the heat generated therein, since the Ventilating passageways are practically unobstructed at all parts of the magnets. Furthermore, the shunt coils being arranged adjacent the armature the best cooling effects are obtained since more heat is generated in the shunt coils than in the serles'coils under normal conditions of operation. The spacing devices for the coils are light in weight and inexpensive to manufacture. In fact the en` tire field magnet structure is extremely sinh ple, consisting of very few parts all of which be easily and cheaply made and easily assembled.

do not desire to be confined to the exact details shown particularly as to the form and arrangements of parts. For example the number of sections in which the lshunt coils are divided can be changed. Also the series coils can be divided into sections as are the shunt coils. I therefore aim to cover all modifications which do not involve a departure Vfrom the spirit and scope of my invention. Y p

What I claim as new and desire to secure by Lettersgfratent is.:

1. In a ld magnet, Aa pole piece having a pair of concentric shunt .coils adjacent the 36 armature end of the pole, and'a superposed cease? series coil and means for separatinall said coils from one another comprising -shaped spacing members U or channel shaped in cross section.

2. In a field magnet, a pole piece having a pair of concentric coils 'and a single superposed coil, and means for holding all said coils a predetermined distance apart comprising spacin members punched from sheet metal an each member comprising a .U or channebshaped ortion between *he concentric coils and a YJ or channel-shaped portion at right angles thereto and between the two concentric coils and the third coil.

3. As an article of manufacture, a ventilsting spacing member for the coils of a field magnet comprising a T-shaped sheet metal punching, the two portions of the spacing member at right angles to each other having their sides bent upward so as to be U or channel-shaped.

4. In a field magnet, a pqle 1piece havin a pair of concentric coils, and a third coil sside theiirst two coils, and T- shaped spacing members for spacing each of Said coils from each of the other coils, both the stem vand the cross-arm of each of said Tshaped members being U-shapedV in cross-section.

In testimony whereof I affix my signature,

in the presence of two witnesses.

' WALTER J. RICHARDS.

Witnesses;r

ARTHUR F. Kwis, Fenu J.-'KINsaY. 

